'''
Description: 
Author: Zilu
Date: 2021-11-04 00:20:18
Version: 
LastEditTime: 2021-11-04 12:31:26
LastEditors: Zilu
'''

# 函数名是一个函数对象的引用，完全可以把一个函数名赋值给一个变量
a = abs
b = a(-1)
